Well, that was a nice explanation. Thanks once again Kent!
Bernard
On 5/16/05, Kent Johnson [EMAIL PROTECTED] wrote:
Bernard Lebel wrote:
Hi Kent,
So if I undestand you right, mapping a function with map() when it is
a built-in function will/may be faster than a for loop, but if it's a
That is very interesting John. Thanks!
Bernard
On 5/19/05, [EMAIL PROTECTED] [EMAIL PROTECTED] wrote:
Quoting Bernard Lebel [EMAIL PROTECTED]:
Well, that was a nice explanation. Thanks once again Kent!
There is a nice (not too technical) essay on the running speeds of different
Bernard Lebel wrote:
Hi Kent,
So if I undestand you right, mapping a function with map() when it is
a built-in function will/may be faster than a for loop, but if it's a
custom function (ie. a def one), it will most likely be slower?
I guess I didn't proofread that last mail...what I meant
Thanks Alan, that clears things up quite well.
Bernard
On 5/14/05, Alan Gauld [EMAIL PROTECTED] wrote:
So if I undestand you right, mapping a function with map()
when it is a built-in function will/may be faster than a for
loop, but if it's a custom function (ie. a def one), it will
now I always used map() to perform a looped call on a function that
would change the attribute value, as shown in Mark Lutz David
Ascher's Learning Python:
# Perform attribute value change on a single instance
def iterateInstances( oInstance ):
oInstance.value = myValue
# Loop over
Alan Gauld wrote:
now I always used map() to perform a looped call on a function that
would change the attribute value, as shown in Mark Lutz David
Ascher's Learning Python:
# Perform attribute value change on a single instance
def iterateInstances( oInstance ):
oInstance.value = myValue
The authors even go as far as saysing, on page 228 (first paragraph)
that map() used that way has a performance benefit and is faster than
a for loop.
Cheers
Bernard
On 5/13/05, Alan Gauld [EMAIL PROTECTED] wrote:
How bizarre. I'm astonished that Lutz/Ascher even show that as a means
of
Bernard Lebel wrote:
The authors even go as far as saysing, on page 228 (first paragraph)
that map() used that way has a performance benefit and is faster than
a for loop.
That may well be correct, at least in the case where the function passed to map
is a builtin.
Mapping a builtin to over
Hi Kent,
So if I undestand you right, mapping a function with map() when it is
a built-in function will/may be faster than a for loop, but if it's a
custom function (ie. a def one), it will most likely be slower?
Thanks
Bernard
On 5/13/05, Kent Johnson [EMAIL PROTECTED] wrote:
Bernard Lebel
Hello,
Let say I have several class instances in a list, and these class
instances have an attribute named value, whose value is an integer.
I would like to know if it is possible to loop over the list of
instances to change their value attribute, using a map( (
lambda:...), ... ) type of loop.
Hi Danny,
Thanks for the answer.
I have to confess that I already use map(), or should I say abuse, for
this, although it is the first time I consider using lambdas. Up until
now I always used map() to perform a looped call on a function that
would change the attribute value, as shown in Mark
I have to confess that I already use map(), or should I say abuse, for
this, although it is the first time I consider using lambdas. Up until
now I always used map() to perform a looped call on a function that
would change the attribute value, as shown in Mark Lutz David Ascher's
Learning
On Wed, 11 May 2005, Bernard Lebel wrote:
Thanks a lot for the advice. I will put that in practice.
The blasphemous example is on page 227 of the second edition, under
Mapping Functions Over Sequences.
Hi Bernard,
Ah, thank you. I'll start the Inquisition shortly. *grin*
It's not often I get a chance to correct Danny, but
On Wed, 11 May 2005, Danny Yoo wrote:
map(lambda x: x^2, [1, 2, 3])
[x^2 for x in [1, 2, 3]]
then we're really saying something like this:
[1, 2, 3]
| | |
| | | map()
On Wed, 11 May 2005, Danny Yoo wrote:
map(lambda x: x^2, [1, 2, 3])
[x^2 for x in [1, 2, 3]]
then we're really saying something like this:
[1, 2, 3]
| | |
| | | map()
| | |
V V V
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